Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.
This guy hovers lazily in the air until Mario approaches. Then it begins to chase him wildly. Should it catch Mario, it latches on and begins draining coins from him at an alarming rate (if he has any). To kill it once it latches on, repeatedly mash the controller buttons and you'll shake it off. It can optionally hurt or kill the player if they have no coins. It can also drain air meter.
The detection range is customizable. Check the ASM file for further information.
Give credit if used or tweaked.
BIG thank-you to smkdan for helping debug a serious problem while making this sprite.